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UNITED STATES 4PATENT OFF-ICE.

FRANZ BURGER, OF FORT vWAYNE, INDIANA, ASSIGNOR TO HIMSELF AND HENRY M. VILLIAMS, OF FORT VAYNE, INDIANA.

GRATE.

SPECIFICATION forming part of Letters Patent No. 698,828, dated February 25, 1902.

Application tiled October 16. 1900 Renewed July 24. 1901.

-To LU whom it may concern:

Be it khown that I, FRANZ BURGER, a citizen of the United States, residing' at Fort Wayne, in the county'of Allen and State of Indiana, have invented certain new and useful Improvements in Grates, of which the following isa specication.

This invention relates tof grates for furnaces, particularly for underfeed coal-furnaces.

The object of the invention is to provide a grate the bars of Which-,will receive an intermittent turning movement about their axes, thereby acting as stokers and fuel-spreaders. The bars are hollow and provided with openings through which air will be delivered to the superposed fuel.

. The invention will be fully described hereinafter, reference being had tothe accompanying drawings, in which- Figure 1 is a' vertical transverse section of a steam-boiler furnace provided with a grate made in accordance with my invention, the

grate-bars appearing on one side iu end elevation and on the other side in section and the fuel-feeder being partly in elevation and partly in section. Fig. 2'is a vertical longitudinal section of the same. Fig. 3 is au enlarged view of one of the grate-bars, partlyin elevation and partly in section. Fig. 4 is a side elevation of one section of the grate-bar. Fig. 5 is an end view of a grate-bar, showing the ratchet-wheel and lever devices for turning it, the journal of the bar beingin section. Fig. 6 is a transverse section of a grate-bar. Fig. 7 is a top plan view of a portion 0f the air-tube which extends centrally of the gratebar; Fig. 8, a sectional side view of the same, and Fig. 9 a sectional View of a portion of a 'stationary air-blast pipe to which the air-tube is pivotally connected.

A represents the furnace, and B the fuelfeeder extend-ing centrally and longitudinally of the grate and through which fuel is fed up- Wardly onto the grate and deflected to each side by a defiector 28, made of any suitable iirenesisting material.

In carrying out my invention I provide an air-duct 1 on each side of the fuel-feeder, said ducts being connected to some suitable airforcing apparatus. (Not shown.) From these Serial No. 6 9.5 8 2. (No model.)

ducts a series of vertical pipes 2 extend,there being as many of these pipes as there are gratebars, and each isi provided at its upper end with spaced ears 7. The grate-bars are indicated by 6.

projections 9 on their outer surfaces, the projections being preferably staggered, as best 'shown in Fig. 4. They are also provided with longitudinally-extending slotted openings 5 between the rows of projections.

bearings formed on a bar 14, supported within the furnace just in front of the pipes 2, and these bearings are open at top. Each bar is provided with a collar 6L near its inner end, which engages the bar 14. The front end of each bar 6 is provided with a jou rnal 13, which journals rest in bearings in a bar 15, and these The grate? `bars 6 are supported at their inner ends 12 in They are'tubes closed at their outer ends and open at their inner ends and provided with a series of rows of radiating bearings 'are alsoopen at top.- When the Vgrate-bars are nottoo long, they may bein one piece, and the bars 14 and 15 will be sufficient to support them. As shown in the drawings, however, the grate-bars are'made in two sections having interlocking parts of any approved design, as indicated at 17, and additional open-top bearings are formed in a bar 16 to support the grate-bars at the joint.

Within each of the grate-bars 6 an air-supplyl tube 3 is loosely fitted, so that the bar 6 can turn freely upon it. The tubes 3 are closed at their front ends and also at their rear ends, except that an opening 3"L is formed on the under side of each near the end, which openings communicate with the pipes 2. The rear en ds of the tubes 3 t'between the spaced ears 7 of the pipes 2v and are connected thereto by bolts 8, which form pivots on which the respective grate-bars and their air-supply tubes can swing. The object of providing this pivotal connection and open-top bearings for the grate-barsl is that when a bar becomes worn out or otherwise useless it may be easily removed by lifting it at its front end and then drawing it off the air-sup ply tube. A new bar can as easily be put in place. Of course it will be necessary to disconnect the bar from its operating mechanism, which will be hereinafter referred to. Each air-supply tubeis provided with two rows of perforations 4 on IOO its upper side, such perforations being so arranged that when the parts are in place they will register with the two upper slots 5 in the grate-bar. It is obvious that the air forced into the ducts lwill pass through the pipes 2 into the tubes 3 and through the perforations 4 and slots 5 into the fuel above the grate and be thus supplied uniformly over the entire area of the grate. Removable aprons 1S, 19, and 2O are provided to protect the journals and bearings of the grate-bars.

To on'e end of each grate-bar 6 on one side of the feed-box and on the journal 13 is fastened a ratchet 2l, and adjacent to this is placed a lever 22, turning loosely on the jou rnal 13. To the a 1ever423 at the point 24. The short end of the lever 23 engages with the ratchet 21, and the long end of the lever 23 is pivotally conneoted with a rod 25, which is common to all the levers. It will be seen on referring to the left-hand lside of Fig. 1 that when the connecting-rod 25 moves to the right the lever 23 will rock on its pivot until the short end comes in contact with a tooth of the ratchet-wheel 21, when it will impart rotary motion to the grate-bar 6 and turn the bar one-sixthof a revolution. The bar remains in this position while the lever 25 is moved by the cam' 26 and the lever 27 to the left. The lever 23 then rocks on the pivot 24 and releases the ratchet 21, carrying the lever 22 along until the next notch in the ratchet 21 is engaged.' Another cam-lever 29 is provided to operate the gratebars on the other side of the fuel-feeder, and the connections between such lever and the grate-bars will be the same as those already described. The cam may receive its movement from the fuel-feeding mechanism or otherwise. j

From theforegoing description it will be obvious that by the intermittent rotary movement of the grate-bars the projections 9 will break up and agitate the fuel and cause the ashes to sift through between the grates and also propel the fuel toward the sides of the furnace, and thus distribute the fuel in a substantially uniform manner over the whole grate surface. Clinkers and other incombustible matter will also be carried to the sides of the furnace onto the pivoted plates 10, and by releasing the dogs 11 the plates can drop down and the incoinbustible matter be discharged into the ash-pit.

Without limiting myself to the precise details of constructionillustrated and described, I claim- .1. The combination with a tubular grateend of the lever 22 is pivoted bar supported to turn in bearings and provided with longitudinal slotted openings, of an air-supply tube loosely fitted within said bar and provided With perforations in its upper side registering with the uppermost slot ted openings in the bar, and means to convey air to the said tube, substantially as set forth.

2. The combination with a tubular gratebar supported in open-top bearings and. provided with longitudinal slotted openings, of an air-supply tube loosely fitted within said bar and provided with perforations in its upper side registering with theuppermost slotted openings in the bar, said tube being pivotally supported at its rear end, and means to convey air to the said tube, substantially as set forth.

3. In a furnace, the combination of afuelfeeder extendingcentrally and longitudinally thereof, a series of rotatable grate-bars on each side of the feeder and provided with radial projections on their outer surfaces,means to rotate the bars to cause the projections thereon to move the fuel in opposite directions from the feeder, and pivoted plates 10, 10 at the sides of the furnace, substantially as described.

Il. In a furnace, a bottom fuel-feeder extending centrally and longitudinally of the furnace, and a detlector 28 above the feeder to deflect the fuel on both sides of the feeder, combined with a series of grate-bars on each side of the feeder onto which the fuel is deected, each bar being supported to turn in bearings and provided with radial projections, and means to turn the bars in their bearings whereby the projections carry the fuel toward the sides of the furnace, substantially as set forth.

5. In a furnace, feeder extending centrally and longitudinally thereof, a series of rotatable tubular gratebars on each side of thefeeder and provided lwith longitudinal slotted openings, an airsupply tube loosely fitted within each bar and provided with perforations in its upper side registering with the uppermost slotted openings in the bar, andw'imeans to convey air to said tubes, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRANZ BURGER.

lVituesses:

GEO. D. CRANE, F. L. FREEMAN.

the combination of afuel- 

